Chapter 9, Problem 9.130SP

Interpretation Introduction

Interpretation:

The value of $\text{ΔS}$ entropy change for the thermal breakdown of large hydrocarbon molecules to smaller ones needs to be determined.

${\text{C}}_{\text{11}}{\text{H}}_{\text{24}}\stackrel{}{\to }{\text{C}}_4{\text{H}}_{\text{10}}{\text{ + C}}_4{\text{H}}_8{\text{+ C}}_3{\text{H}}_6$

Concept introduction:

The Gibb’s equation of thermodynamic purposed a relation between $\text{ΔS}$, $\text{ΔH}$ and $\text{ΔG}$ with Temperature. The mathematical expression of Gibb’s equation can be written as:

$\text{ΔG = ΔH - TΔS }$

With the help of this equation one can predict the change in $\text{ΔS}$, $\text{ΔH}$ and $\text{ΔG}$. For any reaction the $\text{ΔH}$ can be calculated with the help of following relation:

$\text{ΔrH°= ΣΔrH°product - }\sum \text{ΔrH°reactant}$